Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 58: Quantum Gases: Fermions III
Q 58.4: Vortrag
Freitag, 10. März 2017, 15:15–15:30, P 204
Measuring density and spin correlations in the two dimensional Hubbard model — •Jan Henning Drewes1, Luke Miller1,2, Eugenio Cocchi1,2, Chun Fai Chan1, Nicola Wurz1, Marcell Gall1, Daniel Pertot1, Ferdinand Brennecke1, and Michael Köhl1 — 1Physikalisches Institut, University of Bonn, Wegelerstrasse 8, 53115 Bonn, Germany — 2Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
We experimentally study the emergence of correlations between ultracold fermionic atoms in a two dimensional optical lattice. For strong interactions and low temperatures from a comparison of local density fluctuations and thermodynamic quantities we observe the suppression of non-local density correlations indicating the localization of atoms in the Mott insulator. In the spin sector we observe the emergence of anti-ferromagnetic spin correlations and determine the uniform magnetic susceptibility of the two-dimensional Hubbard model from simultaneous in-situ absorption imaging of both spin components. At half filling and strong interactions our data can be described by the Heisenberg model of localized spins with anti-ferromagnetic correlations. Moreover, utilizing control over the trap shape we are able to engineer the entropy distribution within the system.